辽宁白云金矿区外围成矿元素亏损对成矿作用的启示  

Revelation of ore-forming elements depletion on the mineralization in the periphery of Baiyun Gold District,Liaoning

作　　者：李德东[1] 王玉往[1] 张志超 周国超 石煜[1] 解洪晶[1] Li Dedong;Wang Yuwang;Zhang Zhichao;Zhou Guochao;Shi Yu;Xie Hongjing(Beijing Institute of Geology for Mineral Resources)

机构地区：[1]北京矿产地质研究院

出　　处：《黄金》2018年第12期5-11,共7页Gold

基　　金：国家重点研发项目(2018YFC0603804);中国地质调查局项目(12120115034001;DD2016005201)

摘　　要：白云金矿床是位于青城子矿集区北部的典型岩浆热液型金矿床,为了厘清白云金矿床成矿流体运移方向,对白云金矿区外围地层岩石进行了测试。测试结果显示,成矿元素Au、Ag质量分数普遍较低,变粒岩中Au质量分数为0. 38×10^(-9)～1. 67×10^(-9),大理岩中Au质量分数为0. 31×10^(-9)～0. 65×10^(-9),但具有一定的规律性,即向白云金矿区方向Au质量分数有增加的趋势。结合青城子地区印支期岩浆活动影响范围与尖山子深大断裂的深部导通作用,推测以白云金矿区为中心,成矿流体具有从南向北运移的趋势,即从双顶沟岩体—榛子沟一带向白云金矿区运移;同时也具有从北向南运移的趋势,即从双顶子岩体一带向白云金矿区运移。这一研究成果不仅丰富了白云地区的矿床成因理论,也为白云地区的找矿预测工作提供了科学依据。The Baiyun Gold Deposit,located in the north of the Qingchengzi ore-concentrated area,is a typical magmatic hydrothermal gold deposit.The ore-forming elements of peripheral rock strata around the gold deposit were tested in order to make clear the migration direction of ore-forming fluids.And the results show that the ore-forming Au and Ag generally have very low mass fraction.The mass fraction of Au in granulite rocks is 0.38×10^-9-1.67×10^-9,and the mass fraction of Au in marble rocks is 0.31×10^-9-0.65×10^-9.But there is certain regularity that the mass fraction of Au in the direction towards Baiyun Gold District tends to increase.Based on the range of the Indosinian epoch magmatic activities and the deep communication of the Jianshanzi deep and great fault,it suggests that with the Baiyun Gold District as the center,the ore-forming fluid mainly has the trend of migration from south to north(i.e.from the Shuangdinggou-Zhenzigou area to the Baiyun Gold District),and at the same time the trend of migration from north to south(i.e.from Shuangdingzi Pluton to Baiyun Gold District).This research not only makes up to the genesis theory of Baiyun Gold Deposit,but also provides scientific basis for ore-prospecting and prediction in Baiyun area.

关 键 词：成矿元素 成矿作用 成矿流体 矿源层 白云金矿床 青城子矿集区 

分 类 号：TD11[矿业工程—矿山地质测量] P618.51[天文地球—矿床学]